Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a42af9b0dc0760d4ca49b86315d9cd88cd03cbaca608fbafdec965a7bb30d9b' 
  AND token = 'gQI3QJzCAySth+A4GJ0izs/zudutaJcAtkJ0Wufo4oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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