Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797f48100deb201ba14b1d0d2deb38cbee520e127a66fb865d9c427b35e0c1ce' 
  AND token = 'BaoT2HLjwBX2OHKhdVUVKZPqLVvkTrKSGa8ZaLIQgsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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