Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dcd90e0005c7c764272cdb1411671709df9f80ffb7a2d8241df3190d5b9b7fe4' 
  AND token = 'ZyNxQLlC1t5Nqnpxxy2jZDrzo2MdzchwVi/S7UJAALk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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