SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e089b156b747c0fdfaf43b02c810f6b3506930d7176b41e66d2478bd57602fdd' 
  AND token = 'B9YibQjgabrm6YOOXhJ+WYjxMV0K7bR65hDJEYVs7UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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