SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d8f4cd74d23b97c63b804b80b8c8f001099e4f46827b2a82520cfa50c245cc5' 
  AND token = 'xo0ua8+YXhd4R0IZKRe/zvcpg+NW/OxA7GgZLIdU9s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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