Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a304e20a5ae5a4615946d02f5e0cf4285a5a4c15adcbaff1f7ac5811ee09268' 
  AND token = 'igHMtRnqaD3RUUwIUgczHNxLLn7Fj2kNZc1kZhWD8YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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