Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb3a3ad2ea5f68312d06a4602d3cd3ab1e7c318870173385ef7f4725312cc51' 
  AND token = 'lSKf9ImlAUmcjuy8RTru4anXT/l3hMFZBQWI+rKrSO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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