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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d8e2169247fd52dba96837a086f708938be2f333ffdc8984a90e855066689de' 
  AND token = 'd/g9hAEz8sEJ0jL6aRGGJMA672L5+2gZ/wSkwnGD2aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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