diff --git a/src/renderer/src/components/key/KeyDetail.vue b/src/renderer/src/components/key/KeyDetail.vue
index 29fd339..6ccbffc 100644
--- a/src/renderer/src/components/key/KeyDetail.vue
+++ b/src/renderer/src/components/key/KeyDetail.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { computed, ref } from 'vue'
+import { computed, ref, watch, onUnmounted } from 'vue'
 import { useKeyStore } from '@renderer/stores/key'
 import { useConnectionStore } from '@renderer/stores/connection'
 import { useI18n } from '@renderer/i18n'
@@ -34,13 +34,46 @@ const typeColor = computed(() => {
   return colors[keyStore.selectedType || ''] || 'var(--text-muted)'
 })
 
+const liveTTL = ref(keyStore.selectedTTL)
+
+watch(() => keyStore.selectedTTL, (v) => {
+  liveTTL.value = v
+})
+
+let ttlTimer: ReturnType<typeof setInterval> | null = setInterval(async () => {
+  if (liveTTL.value > 0) {
+    liveTTL.value--
+    if (liveTTL.value === 0) {
+      const connId = connStore.activeId
+      const key = keyStore.selectedKey
+      if (!connId || !key) return
+      const exists = await window.electronAPI.redis.existsKey(connId, key)
+      // 用户可能已切换 key，跳过过期检查
+      if (keyStore.selectedKey !== key) return
+      if (!exists) {
+        keyStore.selectedType = 'none'
+      } else {
+        // key 仍存在（TTL 可能被其他客户端刷新），同步实际 TTL
+        const ttl = await window.electronAPI.redis.getKeyTTL(connId, key)
+        if (keyStore.selectedKey !== key) return
+        keyStore.selectedTTL = ttl
+        liveTTL.value = ttl
+      }
+    }
+  }
+}, 1000)
+
+onUnmounted(() => {
+  if (ttlTimer) clearInterval(ttlTimer)
+})
+
 const ttlDisplay = computed(() => {
-  if (keyStore.selectedTTL < 0) return 'No expiry'
-  if (keyStore.selectedTTL === 0) return 'Expired'
-  const sec = keyStore.selectedTTL
+  if (liveTTL.value < 0) return t('key.noExpiry')
+  if (liveTTL.value === 0) return t('key.expired')
+  const sec = liveTTL.value
   if (sec < 60) return `${sec}s`
   if (sec < 3600) return `${Math.floor(sec / 60)}m ${sec % 60}s`
-  return `${Math.floor(sec / 3600)}h ${Math.floor((sec % 3600) / 60)}m`
+  return `${Math.floor(sec / 3600)}h ${Math.floor((sec % 3600) / 60)}m ${sec % 60}s`
 })
 
 function openTtlDialog() {
@@ -53,6 +86,7 @@ async function saveTtl() {
   try {
     await window.electronAPI.redis.setTTL(connStore.activeId, keyStore.selectedKey, ttlValue.value)
     keyStore.selectedTTL = ttlValue.value
+    liveTTL.value = ttlValue.value
     showTtlDialog.value = false
     ElMessage.success('TTL updated')
   } catch (err: any) {
@@ -246,7 +280,7 @@ async function refreshKey() {
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
-  max-width: 300px;
+  max-width: 500px;
 }
 
 .copy-btn {
diff --git a/src/renderer/src/i18n/locales/de.ts b/src/renderer/src/i18n/locales/de.ts
index dbbb5f9..40bbd28 100644
--- a/src/renderer/src/i18n/locales/de.ts
+++ b/src/renderer/src/i18n/locales/de.ts
@@ -105,6 +105,8 @@ export default {
     ttlTitle: 'TTL festlegen',
     ttlHint: '-1 = kein Ablauf, 0 = sofort ablaufen',
     ttlUpdated: 'TTL aktualisiert',
+    noExpiry: 'Kein Ablauf',
+    expired: 'Abgelaufen',
     exists: 'Schlüssel existiert bereits',
     batchDelete: 'Ausgewählte löschen',
     batchConfirm: '{n} Schlüssel löschen?',
diff --git a/src/renderer/src/i18n/locales/en.ts b/src/renderer/src/i18n/locales/en.ts
index 649cab2..a1bd599 100644
--- a/src/renderer/src/i18n/locales/en.ts
+++ b/src/renderer/src/i18n/locales/en.ts
@@ -105,6 +105,8 @@ export default {
     ttlTitle: 'Set TTL',
     ttlHint: '-1 = no expiry, 0 = expire now',
     ttlUpdated: 'TTL updated',
+    noExpiry: 'No expiry',
+    expired: 'Expired',
     exists: 'Key already exists',
     batchDelete: 'Delete Selected',
     batchConfirm: 'Delete {n} key(s)?',
diff --git a/src/renderer/src/i18n/locales/ja.ts b/src/renderer/src/i18n/locales/ja.ts
index 2d3b998..02baa1e 100644
--- a/src/renderer/src/i18n/locales/ja.ts
+++ b/src/renderer/src/i18n/locales/ja.ts
@@ -105,6 +105,8 @@ export default {
     ttlTitle: 'TTLを設定',
     ttlHint: '-1 = 無期限, 0 = 即時期限切れ',
     ttlUpdated: 'TTLを更新しました',
+    noExpiry: '無期限',
+    expired: '期限切れ',
     exists: 'キーは既に存在します',
     batchDelete: '選択を削除',
     batchConfirm: '{n} 個のキーを削除しますか？',
diff --git a/src/renderer/src/i18n/locales/ko.ts b/src/renderer/src/i18n/locales/ko.ts
index 4e9c621..b2c2371 100644
--- a/src/renderer/src/i18n/locales/ko.ts
+++ b/src/renderer/src/i18n/locales/ko.ts
@@ -105,6 +105,8 @@ export default {
     ttlTitle: 'TTL 설정',
     ttlHint: '-1 = 만료 없음, 0 = 즉시 만료',
     ttlUpdated: 'TTL이 업데이트되었습니다',
+    noExpiry: '만료 없음',
+    expired: '만료됨',
     exists: '키가 이미 존재합니다',
     batchDelete: '선택 삭제',
     batchConfirm: '{n}개 키를 삭제하시겠습니까?',
diff --git a/src/renderer/src/i18n/locales/zh-CN.ts b/src/renderer/src/i18n/locales/zh-CN.ts
index 6cf8f23..12f2918 100644
--- a/src/renderer/src/i18n/locales/zh-CN.ts
+++ b/src/renderer/src/i18n/locales/zh-CN.ts
@@ -105,6 +105,8 @@ export default {
     ttlTitle: '设置 TTL',
     ttlHint: '-1 = 永不过期, 0 = 立即过期',
     ttlUpdated: 'TTL 已更新',
+    noExpiry: '永不过期',
+    expired: '已过期',
     exists: '键已存在',
     batchDelete: '删除选中',
     batchConfirm: '删除 {n} 个键？',