Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e6f23bbddbdee1a8ad821407188a0c96d9aa2d7e2b72e320f98a8638930d51' 
  AND token = 'c4WxGv1upCSLKZBTEQkJi8a7sOD+R6Da1iOeGEDQhLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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