Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f843b9031c11e23a08f4e57b5ac9cf3ee71adf9a1232b5e71eed43cf596069' 
  AND token = 'vr9XvKS1pWTlM3XiB6rpZ9uT+A0Dtfy1eKPDzIubBvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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