Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f66a0111a08aa4b30a70d32ffd6ef0ca3c8f9ce4c3124ea9f6b250174390aa' 
  AND token = 'IY4plfaO+2TGpMFuGzMpriLfZDxmHIqC2ENzhPka6MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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