Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39ef71d65b332f312fab51e4a4cbf0790fe32c50022a8f00c53e0f3211b104f' 
  AND token = '8rZi7BKOQpd/rBvPecYXRZz9oHldIwsAZMuX6UtngRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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