Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0df915df9d9887fe32688818d7fc6b6888c1eb2dc07331a5b4e1eddb9a59c39' 
  AND token = 'EJK2KovXnP+RparIjtMEAW5Yi8+YG1JMlVNxjE0zVI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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