Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255eabd749c79e3f560d73362fc064637e1ed5f609f121070428143a91f40ae8' 
  AND token = 'FKi6BBFjLncsTPr7OCmOW1YcuwnKNbJ+nnFcGBi6WQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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