Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d81dd3eb812e04dee61af47441ba2de1ca1e9254ed5f6ca79808ee80757f5d5' 
  AND token = 'c2SfrHWgUj2FZSp2IOWEUgAukG1udYF4+0JJKK34IYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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