Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45a1e4aca33012f715e699b6b8e52ddbee1d2503c09f9da93c065ea612a23f0' 
  AND token = '1umDVYnHOUNsraoow9f/unmm6cBjiWSswjCIPCOgNm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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