Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6fb365289eea866843a901e8ec3b6c039c3a490edae239a75c98ed6f5d2adf' 
  AND token = 'Nq5ClFAtpAbsE2LnZ0f4n4bWjRYIE8LJw6rzD7ZlqXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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