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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a679d08024a20d5e41ed73d7013795b9862ad17faa0f9ef499dfe2ab70c899cd' 
  AND token = '+LetAZ234yrLrZwgLCnGuwGnhBk6FJk5zFfGdg4GBOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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