Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5648ba06b2fec7e030716d801f250a9986bf6bc27c57b622c421a48286e662cf' 
  AND token = 'MPy9uBHAbCwsyl7cg8eUyn6WfvGwlB7NTBRkbG9QCk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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