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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1acf4f09aa4e7322cd312ae0a7eaec1ecb464b5a3e652a9684c01f037e978c16' 
  AND token = 'deCykasiaZm9TuSvaor84JeESKqe+km5pySgGHXWx1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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