Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767ea6d4318ef355341b0e0f4453426b020f9eb88ada990599bf67c4ec26c574' 
  AND token = 'O2qjE+kLy71uEzOmOGKFrKZTktOHK+Q45aKnvi04HLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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