Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2874eb0ec12503d5d37b63b7ffc5bbeeaef39687d4353be1c2f4ea1de4a72a' 
  AND token = 'fwa8JFk7WIcivcbOwnj2CFHFqLVvl9iKkYFhyaINm4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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