Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8bb4c45243b0f19313d37553e35b10df93fff353bc72515f694e23db6229f0' 
  AND token = 'VtxGD3YFC6f5BJsF4PKiQjiUIAhRmtwvVJioPfOrayg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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