Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c9bdf9d40fc34abce749ac4c8887b1aa581cc6bb813215ce43fc8a89d26fed' 
  AND token = 'Zd2pvGO7fsPiL7LTouspeucwY66NwAiUyIRCiX/2Uf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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