SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '84263593358fb3488157b625a2951c06592fda2ed25ef4c341eb5fcf193fed16' 
  AND token = 'duKSY29/wHnG7L6v2W1aKx4KxdcmsY/dR+aQW4zuWJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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