Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f3721709bec9e9988e034efbcbd2d9c4b37e8c4a12d4005ff69f51ad7f6dee' 
  AND token = 'Osn6HXi1HXXCNqEFzSJ3TIw+t6aq7N53rNso8dwF8Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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