Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327f5cd3e1a3b2bbef6e8ea1b3959a60eea90d30bca8a08ba9b0e8271b7a207f' 
  AND token = 'jnabXQRoHx6OZxIwTIWfiJ6Cnm48Td+r1FAG4yHQ1Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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