Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27cdb8754e1ba46dfe583d3c86089e9fa1e69f57b6feee67d50d59a25bcc3c7' 
  AND token = 'D65vSBlCXY+6HDykxPcBoByNNqUiF439h22aYas9kII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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