Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275b0d2b2b415cf423b3294b2b2f064a6b354aee2bf5e691b18349b630055fbc' 
  AND token = 'qVkQqP04Nro09fAGU+ZirwcBKawPNB3CY2AyCGB6MT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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