Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd00a80b7d0a616c1afe9b74e63f69e0bab7c71d1c0406faaefa0314ad26355' 
  AND token = 'RCDjf6q/k6luwzqcSFfs6PH2PRKo28DMg2cAltCVCvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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