Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3336c30d0f12989c02c8a3f101eb8dfa7cffa247ac966167b5c6319c3235c761' 
  AND token = 'mB3efG6AsCjy6MC4b3GfnKp49L0vmOFICNhk+zmbUFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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