Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec6ec8ba4930eb69629e9bc568715511724749344e36b9e3de540386942982f' 
  AND token = '9joLnyfs2l4dx/Z5KYtKmdxgwixMqiSLYwIMTrmvsc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00151

JSON explain

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