Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef75cced71f8a28334cc061354f54023931c381be786f08cc7aa5f7912e85ed2' 
  AND token = 'sLoTbB/1AZVdgh30sRyGyDJ7SDutKJE55Dozup9Eeas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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