Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d31043f46dc983f0311c2076d7d66276b6fd898566c6c17301dbfff999a6497' 
  AND token = 'h5fvLb2f08kc95Hb74Y1bxRjpyknQm0BTUapc9Oa/t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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