Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaacde338362d66696a1f3b64fef2dd37b71e7566b272bca3fc038673ef2cce0' 
  AND token = 'r6DtYEsv8ekf93ebfqV5Dm0NjtSZQqQIVZWeKpKnN8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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