Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfa924ef728e5260e5bf81a0c850a8b54648ef0d77e233d2798b8a1836b7630' 
  AND token = 'LwdS3qSAz7ATgWHvgbMKDCIA1OVNcNhfo9KrczhfxAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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