Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706c71a7fed26e6eccbf08015fd674843749f284d21b526dedbd78302242775c' 
  AND token = 'Ebt75jFgoUy1NAHjBdWGkeAlPuw8IlsbnufBCuw1hU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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