SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd0afd3a878138ef6378db0f36a4d0e6a3435137a4cd7508f213b09e8d13b3e4' 
  AND token = 'iGF42zeKKIfrF5zTyO+d4YmvsYErCa0XuS9vH/gYkhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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