SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2f4a97f60318bc80515c3b676ac6224c7ffcb569e7b316d285302e109f4cd4a4' 
  AND token = 'zcMtQZtheWBeo+pR0UNj4O9oXdqDEKCu1PCzAErGHek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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