Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0967e5c6ff95ac34025b579a12dace696bfbe1e2d0865eed8ee4e858533992' 
  AND token = 'CW4NnrJ+iL0BIvqOig4NPrpKRbhRL0Bqfie4qUiifZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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