Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8047f4dd4c5396d6d011e1f365a1a35f9361468de5a2a4a7cc1a21523e6ed396' 
  AND token = '5Zc7Dvrv5pOwdjdVmegoahqCYnhf/YbjiGMKS0fDXRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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