Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '146380dbe5a198cf5e018874ae1f1bfb3904a30eb857c6467f5672df396f01b9' 
  AND token = 'jWo/8A28dpO1QdufCpAgwA8UxdVbTmSg7ZwpT6iTQng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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