Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad239e69782b86a8295aea1ad191ed0dec4d921db434d4458730598e7a159c4' 
  AND token = 'Bj3eppX2oEZk3sbGqSUYXNtynnlQlIfMu3HqprCzE6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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