Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938b5b54417401d09a6d9aa61a330772fcd29091a1ab109f57879ad3e11ab391' 
  AND token = 'uGHa8S/Se24LKUROPExYeZCtNzvYho8E+PeQfBPV5Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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