Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13902fb7fa1748cd6bedefdd4b3653ac7640add9764a8bec290c4812785844bb' 
  AND token = 'AaDP77OGHCM/Y6b+4bhvQYVter4bOCkf2S7UsDlFFLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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