Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c75846f76349a05d3113ef37809e8a11bb4f37982eb98e3278cb786aa46756' 
  AND token = 'lDKy449t4GGBX5s3C4NNf+srehNYf5hv3Wh56L1g+nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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