Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcc88a0075f3fe682b56fcd45ea580dd0713e9f519e2b31daaa2f115a47776c' 
  AND token = 'txGp1LcAdOFoGES0opDb5KUUpcEFYgPLg74sx5ZT0L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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