Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaf0bb5f3dc3d080f6e826b68c3ed67c5631ca1875ba40ce0f631cfcc92aae6' 
  AND token = '7Mb2TUqcu60IQlPVKJxxzX5z7WpYDQ3KHgZ5EItxwrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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