diff --git a/database/wheeldb.sql b/database/wheeldb.sql
index 67edf2e8..76c8485c 100644
--- a/database/wheeldb.sql
+++ b/database/wheeldb.sql
@@ -86,6 +86,7 @@ CREATE TABLE `t_chip` (
   `modifytime` int(11) NOT NULL DEFAULT '0' COMMENT '修改时间',
   KEY `idx_account_id` (`account_id`),
   KEY `idx_account_id_item_id` (`account_id`, `item_id`),
+  KEY `idx_expiretime` (`expiretime`),
   PRIMARY KEY (`idx`)
 ) ENGINE=InnoDB AUTO_INCREMENT=10000 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 /*!40101 SET character_set_client = @saved_cs_client */;