Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1636841ecf2a818b1a06bc25f7e5c719b7c3d9b60d339dae2866517e4970ea42' 
  AND token = 'CEPkkdqUZxPGXGRhrxNJAejN14smdle99xJY87AqqvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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