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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '544428c1064f6e972a73f9a035fa468a6a39449103505ea544719ec970689050' 
  AND token = 'bYTOVtgvN4mGsGInqAchN9wvqvvq11E7Dt+5ivNiJyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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