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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'add7432ab316cd156103f36e3e60daab38d3ce8efe2f2bdd700e5271ddb0cc7c' 
  AND token = 'pfg1TZR/br4OqfO3J7fm9Mz29tJJEQODlKvSLmQQ234=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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