Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a369304185bc2a99a6910e9912e5693b98c14ca6ee06f2030caf6bdd961144' 
  AND token = '64t1FyF2nC9/bZoLM94t4fi0lzu47irGljtbU5ZHk5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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