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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8aa551ffc778fa1fb24f4a605ca87b146d8f49d4a15e4a10fbc4af8e664c5810' 
  AND token = 'aFsHdoytkUDKQYfh6z82WOqNeIBj7Caq5IcorrC34ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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