SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2dbfb000dedea8b522b78eea0a75f4698c35a46fe7209cbca81647d157a3eb5d' 
  AND token = '0HywcwYWDCakU7kq7+cZlhEgnAmrXC7XLuJBmwaIxPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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