Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35c31cded33177a269ae72ef1751c94cf770d6d0d736589de45520d687432c7' 
  AND token = 'FM7FVavqBALw4S1ZYyyctxmUsRlzMOu8fEycOtZKwQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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