Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9927fbde57635f48064bd5e74dd6f0d1b9d35a85288b39fcdda07b9b17e1f1' 
  AND token = 'mWLbqOlzpc3tDD1EiQsbLauSFmcRrKaHUmoud7HktXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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