Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd55ac5a6d5ee60bd77e8a874ad6e2f3ecebc9e1ea8aa96e6956738b5043e7d' 
  AND token = '1MsDv1w28DxuNXggZpL2IwxyeJbxYqSMNYYefRZ5Viw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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