Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8d79917ce2e795a6d33dce5652aa53644646c8d136c94e99d43eaff23a6461' 
  AND token = '4wO9nAcwKZiRt6kKqui0nEbTX+d7WY0mQBXQgsZy3+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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