Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beea26f1370a7e3cd77dc7086e7c21a8750d991192bab813c44e3fa6c069b7ca' 
  AND token = 'upQKiFxy0pXZCbfJioT//A1+hEJERvrRzg4xE68G3EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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