Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f2a3c34f72f15f9b230a74c83466fd8173fd1841fff9ed89fcde92b30b67e4' 
  AND token = 'nbh9KcfrpAS9ydRcbNWOG6fovfuawupzVbKHqMzQuWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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