Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed9e0cc302956bd035a30a2963f9033442fc225fa8ad516e44a0fa7ad302686' 
  AND token = 'IJDvr7sOoN5xCeSotOyUmdOGFKI6BSTyNKi6uWr4spg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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