Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3b6d119f1d48ad6a26ee7607b06018cbaee813693757a6cb9b5311258b7e94' 
  AND token = 'MLsWkDkYBVmJZmwJ5i0dADDVkJcXJfu4Rl6QBs2+wGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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