Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36cfc20ebb9eea44b9e131b412c70b5532cf3eda34fcb7e62d14314905a4c247' 
  AND token = '6am6VFGgmS1Xduw6N/nxHKHZSBIfHsBeWy1n1/kleXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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