Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620be3e2abbb9b529ec733d0658dfc6c9c784ca5a8f405e0daf78a474baa648c' 
  AND token = '6FYVRsBhHRaSscDK0FHpZtMCVv2lUd8NaeORSidj/bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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