Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744ade288f171325514c93e73b7002863aa643abd8099b0ccefbba18cf81eaca' 
  AND token = 'gjobya4FLfuRXNEYvMGGmbm98vTrbdnwObbeivRKtuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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