Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eca06618118201d8b516f85f7ea7d394fe0c03fbcd43b78d2d73ea570cb2c1f' 
  AND token = '/nsxsegFMvrEXbSBjOvSOH8oW7dzDTaMbS6f/vhuBjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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