SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '650fca1af8dbac3bc1b9c39c1958bd493840634afff85a4e46a509c2e887dea7' 
  AND token = 'IqYVxtswZmv5w+4+yl1urDURPJXZPRz+TANKP3QX7DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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