Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7ccdad5dc338a922342491028d655df88f03418cebed7990578bed657a5cf2' 
  AND token = 'gpOSK/TnbVPhEME11+rIxdfjF8zy7oBwLIUhdAeL6gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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