Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639888a2d4ae77735195255293c46c4cc631862e34530b60dd3750336325dcda' 
  AND token = 'iC7LiVcmcMCVm7M+Tw3EnI+xrNzhc3PEPAyTOxMmKfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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