Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef1ab93fce3ace800c56f3d967aef14cb8a8b30c5f51c32feeec945488ad53b' 
  AND token = '/X9M88SyjcwproroDibg6sQYJXWG3+Pyig/35ylcT/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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