Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03b67eda3d49dc25b75b17dde6fe9fbc45a356a71fd3234233e4213893c9e48' 
  AND token = '39y1q6TGZBMpZxB1Vpt3f809lMvTU35DrGaSs95kpFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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