Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7fb535a642915b625f1fde4460439b7d7a03d8f0c61e47ea337b9e86918d7c' 
  AND token = 'KGQFzFKaGHa58KBNG5nzYblxkQxbT6ilJYLrpGvckcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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