Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3545a766aa026d9be55f7c1f69127b7ebe7f764c39f6de398e3755d79ff53423' 
  AND token = 'ARJ4Vi0+vXObgPUEQ/BOl2ZTI0Ol5lkAsrVfcCUPgZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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