Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf518c459a4bf404218a9ea1fe82abac293b52c8c1448517170076ac9044ca5' 
  AND token = 'MCzgA4eALIrhZGNzs+2q5uuDe93D3u8b5DrJyiBxFLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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