Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c87061cf8d4aa0bbf8b639c135f810da99cc5e8faf09805ff059cdd69849fcd' 
  AND token = 'gqDq3b3dxey4U2aenEaKpemUDsIhf90AC39jawFlwg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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