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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'adb3255311fff61326387264e73591b34d6156ec36d818a930f11b974195d592' 
  AND token = 'nC/JwPiZo3XGj5ZJbbTaWSlx6U6aUp7hSA/zfdzddd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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