SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e88e1b56bdf6c480db56a6aef374783195d0fc1a3ec8b723151428827170169f' 
  AND token = 'iJ4ts/A0jeHlFKTxtZDAGYU+dSHA9M+vbwV+AkAfKoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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