Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde6cbb64cbba849b5eadf4006a4748f43b4bb34266f462c850cc3d41241da4a' 
  AND token = 'a8pQbayAK/X08wSuqu6sTsP2fK3LmSuwk+GINRkK2Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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