Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e9484b3d6a2003b503ec4bf96e8f471e5c7f0789da060e8a54a383d0a78514' 
  AND token = 'rSV0StD1ejwNw6V6d0QsusIh/EQQMd8TllYnjQoz35o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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