SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e97b10d8ab869e913b3318d4b910712f99712510ba49f238a0a74f12993c72dc' 
  AND token = '/Yg+lqO4YFuOPvikqE6hB7pxqDWkof+5ueNqu7Hwmw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}