Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5f3f9a9358f5e60fd3310766ae3f6dadfffa2ba9928af7ae5381c54b10343d' 
  AND token = '5qlrr6qX3iXJ28AptyDDVxXOdSkek4w0PNlEgsQ3Rj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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