Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca6d307235fe3fa76f41b03dda6a6c14b9f52e7f27538ce05b9bbb71c660e8f' 
  AND token = 'gySvM/PfyeZgHJUtjSvT68y1kyJPMxHxPJJFXXZ1kb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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