Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1078c8977bb13998c69701cc80a87d5ff6529273f4caeca586435efac2e476e9' 
  AND token = 'QdIMFvWkwy+AtFkDht7EHSli3ScRE6Om3e2r5qJlNeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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