Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81d1a608718f6c9b0ebd27d78ce0d96cdabaad3bb017f37b35bff376f93487b' 
  AND token = 'WEYCQlfa+Hma8oA7bUTOCooGpRnUuKOM1cL90ECGKYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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