Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad09c718076d316b7bf7350571b946186928b452cc256209278ac0f5a537e604' 
  AND token = 'MiEbzjqTnEqPGE68iVtaxkDdmPYixZkYviUSyygmDOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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