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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22fa8bbd91c0cf500758d34064c95fae99d56920db9465bf3f86e61557c296e2' 
  AND token = 'RbthoUFyDf2xgtx4ZlxxYyg7ypEiVL4g3EPZcU41HRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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