SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e682f540a92bfdd77aad3e4d14648852c66a82e8a9e4800e66a347f55ec30b7d' 
  AND token = 'yHhWvEip12rxv4y80Z99g/aJ/3/ztFffmG8qLlWtamU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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