Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3de4b0a2735c0a53da6e09d7f6fbb74ebfb59ad015fb434978f232b74e77c7' 
  AND token = '+Gj9Ipeviw6QjSE6tkQjl3Dd5hIQhzmcH5aIiZ7sa7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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