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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '06474aaa7485281b22d389846e501eb15464b8fdb52b4f767439213e952690a5' 
  AND token = 'qUxYZPYXGdj6md8Pva8OxJMNjEs/0Toi6I1Ks8a7kDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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