Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f8a534383945dc5bbb0fea0d0db07663c2cee7d036b94f6dae1ca1592e2147' 
  AND token = 'iZba8QrZUEYW89aagRKM8n+/fCX8MNNPmqu55Y/Ru3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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