Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4c6345fe14dc3dbdc9b32445dc343cabbd723df7f2bed297529e120ae86389' 
  AND token = 'UkUJ3jatfdEZoPU0MRVReBw/vY4Thg3v1l10nmkKnSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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