Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab3b9faae95356ccebf285b1ea6f0d5a41436cb15dd1eed31fb60786be523c3' 
  AND token = 'ZB3Cp1nOpVoNhjtvCEv4DWBrqDAZmRzu+/qEkLehSDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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