Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '644a60fea8f1cf9a8c4245fc1005d255092a131168bd226b4a14012baf2334b7' 
  AND token = 'R8djUfnd6lwayb/TX9S3Hxiy2FXjTpnfvJbtH8BSKgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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