Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc1b31886c434d1bfa46f4f26744dc0dbc57f6f4961c2ce8a115d5f74acea87' 
  AND token = '46uWnyjdlfHlKRN1knV+kCBWvZcRbisyEjJ3iP1DZEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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