Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f82e82bc5a01e6efbc9ac156dfd951d910f36f6f4956d15721d4cf127d48c9e' 
  AND token = '7XlmLHRPtPuIeYosFFgfBZBzFP1rahjxUFk9SP4i/9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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