Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68616c711ceb5028a28aa90337eb5e0a7e11b05a3f3f3c8d7d613470c76c494' 
  AND token = 'dYoPU54P1sJGRHFrioIfYSLszFcfQSvJz9N1iZoHDho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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