Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6e1bea90f360fdf2d6d18d84c41c3ff5abf3fbdb05db0d342a589a72cfd23f' 
  AND token = 'ox5HpYcXz+3z0jSYFysBtGf8oHpAM8IzN+XdNXE9iTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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