Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250a5cc2bda5a9a7a92a4937c9c824a7e9cdcca5f910b8b5a3e2840cd3a59f13' 
  AND token = 'jk+iWmFX3ns3VGsXj6irLAl9uRXhLfcHGpa5E8HTghM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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