Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0f6369e544f67d54a410d15f0930fff4994cfa57b0939cfd8856a5232b7594' 
  AND token = 'xNEHcwy3WE6LTncs7tMGGAdJabEQz85d6a9zryFcKDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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