Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c97959fc81c3bb085f83cf516463e26f7114fa02a4be99b61d99d3f33d82968' 
  AND token = '3W3TccZYBZ4te6gFCihEP1PLjOO35W11jaGBvJNwaag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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