Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '019aa2eb0a8dcd5c1a18b0afb3b91b927a917b4e3049e9486c96cfb84cf3fc75' 
  AND token = 'KdzEPhyIc3up1x4jJ0BOPL/lfLlQXcU775hvUK5IP5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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