Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52b237df8d6ef3db5a7e700c7572e57ae870fc05e990c356813a6faef4defbd' 
  AND token = 'AM5H7ig9q2eQpIfLcwBKDusOykyQPu+DGzpZnnRt9Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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