Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6d697e09cd335ff70e12f0d9962e2cd86f3b8f970b018d119076f6533fe95f' 
  AND token = 'dXbWxF0UrMle3VYFwHLbktEGleTWJohq0K8fyFO0dUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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