SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f38010332ae63a7564c917a0887ba55d816d622394e2bc89c9e057b600e7115' 
  AND token = 'YzbnHXBaZIeEhNv47JfzVC4qWy/Y6AhSj3/kzR227tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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