Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aee81baecd8da89ae266f2e762a8afdedab6caf6c0e449fa8e02a24203518c' 
  AND token = '0zqj8e9/kbcgbyVYlgSbjRc/hVtGWJ8hp9XIVVJkNnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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