Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1cab323d0307405d6da20963346e357abdbac4806d9bc8e822c019860593a16' 
  AND token = 'fQaYZoEIOS83IW6BDC62mhWMWu60a0zbOVWxKaf8Tuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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