Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b583e6e13929285fef8d2b1ab87023c042c573e0d35ea1ed14e4e84b84d779' 
  AND token = 'ObYLG2xwNtMk4V4t8KHSSEzeeRKNNvISCptyABDwiD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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