Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8a26719dbd7f5070710f38ca0a292d914cb2209261a9994e8c67fcd91b52e4' 
  AND token = '5RLrmw7rvPu+11pWaL3rzCizv0q6+RQw7Jj6QnjmVi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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