Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82d0749628bc3c1a80b00a9af9d2e09e7315ecbb41cb939e4c96ec78e56ce50' 
  AND token = 'iAr4XP3QuH0TdzUCc2JtHx5CjBxxe5OrINoD1OBd9Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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