Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d68358ebee100696de99695086d2313eeec02e464da399704c6a6ed4b026007' 
  AND token = 'eyElpZrhjeuj8zNJbaXhLkxATgVajSPr8BC0jgDtMhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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