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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '561410d7cea519653a9384e282e17ef9b72da7b7b09d47e680ea1802d7352072' 
  AND token = 'iDE1JXllS2+HYorJJ8pVEBkRbbzNlWsBLcYI+odT2L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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