Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ae8403b3f48ba6f95a05c27c71e06f3446f346224d0ddd27b7586ddb8ba358' 
  AND token = '3+lHK0QG4zUi3OS8MvzkT4oDgjCUb7ysC3tN3ya93tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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