Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71878702d4014c1f4f12c2f6c4ba09060c22f0d01abd7509f01ccb56dc54e0b1' 
  AND token = 'TLAvyy+S7TKpVhh1QC8HUkZH4TlWW5pFCONgeC/boBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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