SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a5d73a29f93861b2a8f8cb07f475a8e0ac8d09b456a725e39c574fd88c476158' 
  AND token = 'CIZ7Jv4dxkSKZ1E7flGjOF9SahKFhEL+sc+3JmRMnzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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