Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad9d43e65a440d690edbef960d5d99be59c73662a08e39ae63dd4ce8ce14b81' 
  AND token = 'RmhQuyx5S6lZ49P4kHgvh5cvsWhNWAbO/Fx1b2tJ5qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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