Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408c75e684ebe0226c9160aae31540ec9e648453bc04a9c708782b59cad66727' 
  AND token = '7pTc3X5DfQPfY+bb4sH5bHTqOs6rpiGtbXseCZGZ9aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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