Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b0444bcccd0c6e8230b673978ad8b14bf455e40fc92b1f80fe57ecf91442e7' 
  AND token = 'tfkrdZMlyxiEx+p9BzX0cW7WxS3GdpXijF+YYIpHVVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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