Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b39e06d6d47c4c04dbae7ca18c22db68d3ce792354f779512b3313f3615e9aa' 
  AND token = '5ZSXr3juVWo5lrKlb3nd7d/cjqazLUzFiEv7vCmQCD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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