Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155c5c251fc76dd69f66ca07397c549fe7c63fdf7e67ee159fdf57af93067165' 
  AND token = '94pua7ValJ+a7h50LPCOvuTQiaARqukK6NDnbcBAprI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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