Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84963157e6c5d5b33e1b43eb19c8da917d33dd220e9ce03a6f1257a80cc63702' 
  AND token = 'FrbFuVrfyVhyRjQtsjJoyuz/qZdSArwb3XsbTzoMhLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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