Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e9fcf702b31cf04a1ed1c7861e4b404f9602fa92b95521f31ae147e535a3df' 
  AND token = 'dFeKDhhNG1DlXllZIXxOYTfDlWopA1zkjaJnN6Zp31g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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