Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8cc90c4e318d96cddee9347e933f9d651be21e9a67634cf608cf6801c0296a9' 
  AND token = 'XGaqWOXQOii4zJ2HBu4apbxKayEk8uwVDMMNw7wpjFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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