Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d8c7019efc6a35680aba6b4b3fa9661c0f7c4bd27b51ff479e683b66634152' 
  AND token = 'Fvwn1giF40L9ZrG4vSaTIrMAQheJHo8z6WfUGBc7e8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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