Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cae13a8b55d07f145a7747e3fbc46840cdd505743f09e85ab02abfade6e0ece' 
  AND token = 'MBxKCf4lpkttEzxtdbrU3JYsKz6RDs2apqUQZF3M95Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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