Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2cceabe35688e6ab51e770fba045efc04e7bebc8954492f96898facabef875' 
  AND token = 'xYxPHYqD8kQi3Vcys1DqNVqas6r/+YYpdbbQkhcRvo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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