Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d65a789d64c26ab4b0d81072ed2730f3e79876c236f78c1d08adf73b1ea6140' 
  AND token = 'vYFFdFsS6NjZ16+bL3LevyazTqtLRXyKpIi1izJVN3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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