Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2215bb0b2ed7f8f2ee5caca6992c3ccfb6907615bf4a4c1e4977ada2431a21' 
  AND token = 'hg3LaVSvaEi6hgF+KCQaraJKbC5UlRt0KP61OyaxxCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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