Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0100190f7c9d451bd3a868aea6671ec97313587267a4a4e2012f7fb7ea8d83' 
  AND token = '+FFV+GKuEpFG1pWWpM1w0ERozQwNc+jRo/OIdEBhfWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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