Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310748f683e9821eb5792625087383b3792744f504942941d3cabc5ff51ece29' 
  AND token = 'I9df1almjh8oojOKpz10UW1iSOTI/CE6yHsRdYm9n5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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