Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb0a02ff74b88346d0d5955251b39ad8d0ae6b8d1ec6b2091270a58a7ca79cc' 
  AND token = 'EH+ls/9snjcE1B2PO87Q2RzS4nI9H267zLHL5ZYZkTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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