SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2065d367b6a792cd96b1c9e05959fa353356fe811b4accdc8d06b3cc99642203' 
  AND token = 'vhhkhzHDn+zUGgwFQFYF5ph5RQXkwvd46LqEB26kogw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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