Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f25b7b0793f2860036cf644c2dddff1a793891e0e6919986863b7658a10813' 
  AND token = 'ua/Sq2b8B1wlOVfrCGaQSaagUe7CzE4Nz5rq4v9bRYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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