Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f10a74363869d7f2e369ac6ed8120092dd4bcf399907c50a5300e765aaa389' 
  AND token = 'cLSWjkhBbWYdcBHaUpbN5+DN2rm/OEgFuOVYOQ9jDVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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