Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b55a9fadb8e6192a072eb4e2cfbf542f08d50e87beabfd83e2e3d16e7faa876' 
  AND token = 'WPvHTvVhXDcmdX4SvJX6a37M59wObhNyY6Y09Akey9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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