Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f714737b152eb13bddd22d891d6f63237949ac8815b3a857aed8d853d43716b5' 
  AND token = '4NUFgQTNa83ed+LNB7xOEPsPKNkNTemiVmJBlpC3+8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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