Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943ddcca6d8d00599ed07c6490345558354001ac74c42580600b51509f71fb50' 
  AND token = 'sbSXzFaehCkTrnk6hhJC72UpbyqF4rLB81ifL70XGaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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