Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6f5c2a078498dcc8f896aad6b989752cdc4d5e04525f9aec888f691f01a990' 
  AND token = 'fNGBgB/Natndve3PcgMgK/TVAJhm72m0hnHcv2vuDBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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