Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a7c2290375cc46c5e3fd6eb0bee9981de701ee04ed0e96e58fecbf80a29a12' 
  AND token = 'RE6Y4cd+UDdpNlHY5e3w5vCnKCAMIJP40DwjJUVJZQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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