Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b026d9389eb6b710506b2d3b8839f2e6dd0e661821cb08ffcbb9b7f83c9127f' 
  AND token = 'MkzS/B19faNKhBKKURvwpR9R56VWWuoc3uWDU5t3+/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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