Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488005c3eca809d359198d719e332efb638f96944c0830e03c43649cb01c98dd' 
  AND token = '3FiGhpF1c16aGGRzDXvpr+il1W91BqDODvj8aI4zK3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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