Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ef3c501da5521ec285633e4e5f542ab54e20809eb10f6b23a4235b95700f9bfc' 
  AND token = 'TId3LTZrVDC6gO8YtSxTeL3+huJy/eSs5hmQAN0vXWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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