Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2640df2561d36913f885337359d1b9696cb91c5966efff825f649753db4a76de' 
  AND token = 'smj4AEgAMjjytQzGRQKxekXEUSmQ+1d+12APKFMTwuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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