Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee79c92ae57b74b812f0efc1156fd7cb1a4020abe40357f1de351d12901e15bb' 
  AND token = 'byaneSckhdbl9LmxqdNL24y9q/94kS2NptBRzSb5ENI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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