SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd8324044204444d014ab3cd9901549824c64ebae277a5f5f8bd5959a1373ca9e' 
  AND token = 'pyUN+7jxV+gV+s5QsOoSkUBJwWRZTmUMGyL3iIC09oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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