Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7ebe90ca025ad559ec5454e07a237ff3fb6451db6a8cc3356cf7c984a96647' 
  AND token = 'UI/XuFsMPJumAmnuebcxCC73euzQanubXiBPqCB0S1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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