Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33cd53479f461fce8869827b1870b03667f7971169d46b14f8a0eee23fe67fe5' 
  AND token = 'xwBntR3N36U4vg6EbFm7CEABMAI5YiWT6nlL5siBOAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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