Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1451c5ae537d6c89bbf3e1a987bfc2382a9cb40b0b89e2fc9af0cff0ca05223d' 
  AND token = 'AWSvKg4QPb6lt+eAQM1Hnm8AIhTNJtgcVFHsG1ztn04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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